Tomoegawa Paper Co., Inc.

Hiroki Totsuka

Masahiro Maeda

Akihiro Sano

Masafumi Kamiyama

Masahide Sugiyama

Masanori Takahata

Hirono Takeuchi

Shuuji Mitani

Toshiya Matsushita

A separator for a lithium ion secondary battery, comprising a porous base material containing polyolefin, and a porous layer containing a vinylidene fluoride resin as a main component provided on at least one surface of the porous base material is excellent in electrolytic solution retention properties, adhesion and bondability to electrodes, and dimensional stability, and also has high and uniform ionic conductivity, reduced interfacial resistance to electrodes, and shutdown properties. A lithium ion secondary battery having excellent capacity characteristics, charge and discharge characteristics, cycle characteristics, safety and reliability can be provided by using the separator.

Separator for lithium ion secondary battery and lithium ion secondary battery provided therewith

The present invention provides a suspension polymerization method for producing a polymerized particle having cavities in the particle. The method includes the steps of: placing a continuous phase component of an aqueous medium in a continuous phase vessel and a dispersed phase component composed of a monomer composition and a liquid noncompatible to the monomer composition, wherein the liquid noncompatible to the monomer composition is suspended in the monomer composition, in a dispersed phase vessel; subsequently supplying continuously and simultaneously each of the dispersed phase component and the continuous phase component to an apparatus for providing a shear force; subsequently exerting a shear force on the dispersed phase component and the continuous component to form a suspension material including polymerizable liquid-drops of a desired size; subsequently leading the suspension material to a polymerization vessel; subsequently subjecting the suspension material in the polymerization vessel to a polymerization reaction to form a polymerized material; and subsequently drying the polymerized material to obtain the polymerized particle having the cavities in the particle.

Suspension polymerization method and particles obtained therewith

Suspension polymerization method

The present invention provides a positive chargeable color toner wherein to the surfaces of coloring particles comprising binding resin, coloring agent and charge control agent as the main ingredients, is fixed a positive chargeable compound in the amount of 0.1.about.10.0 parts by weight per 100 parts by weight of the coloring particles.

Positive chargeable color toner

The present invention provides a suspension polymerization method which provides polymerized particles exhibiting excellent charging properties and a toner composed of the polymerized particles obtained with the method. The method includes the steps of: placing a continuous phase component of an aqueous medium in a continuous phase vessel, and placing a dispersed phase component composed of a monomer composition and at least one solid compound having a specific structure in a dispersed phase vessel; continuously and simultaneously supplying each of the dispersed phase component and the continuous phase component to an apparatus for providing a shear force; exerting a shear force on the dispersed phase component and the continuous component to form a suspension material including polymerizable liquid-drops of a desired size; leading the suspension material to a polymerization vessel; subjecting the suspension material in the polymerization vessel to a polymerization reaction to form a polymerized material; and drying the polymerized material to obtain the polymerized particle.

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Shizuoka, Japan

Hiroki Totsuka